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Loans and Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
contract
Jun. 30, 2020
USD ($)
contract
Jun. 30, 2021
USD ($)
contract
Jun. 30, 2020
USD ($)
contract
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and leases receivable, impaired, interest lost on nonaccrual loans $ 2,600,000 $ 2,800,000 $ 6,000,000.0 $ 4,900,000        
Interest income, cash basis method 538,000 484,000 1,200,000 1,400,000        
Loans pledged as collateral 14,290,000,000   14,290,000,000     $ 15,050,000,000.00    
Total loans 38,236,018,000   38,236,018,000     38,252,984,000    
Allowance for loan losses 516,708,000 588,648,000 516,708,000 588,648,000 $ 563,214,000 605,736,000 $ 493,452,000 $ 281,402,000
Reserve for unfunded commitments 46,900,000   46,900,000          
All financing receivable, allowance for credit loss $ 563,600,000   563,600,000          
Allowance for credit loss, decrease     $ (89,900,000)          
ACL to loans ratio 1.47%   1.47%          
Allowance for credit loss, reasonable and supportable forecast period     2 years          
Allowance for credit loss, straight-line basis historical period     1 year          
Downside bias 40.00%   40.00%          
Estimated unemployment rate 4.50%   4.50%   5.70%      
(Reversal of) provision for credit losses $ (24,598,000) 141,851,000 $ (43,173,000) 300,573,000        
Net chargeoff amount 26,500,000   46,800,000          
Financing receivable, allowance for credit loss, period increase (decrease) from increase in size of loan profile 10,600,000   25,800,000          
Financing receivable, purchase 434,600,000   1,040,000,000.00          
Recorded investment 6,801,000 $ 15,652,000 22,274,000 $ 52,348,000        
Commitments to land additional funds to TDRs $ 0   $ 0     0    
Troubled Debt Restructuring That Subsequently Defaults                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of contracts | contract 5 1 5 4        
Recorded investment $ 172,000 $ 27,000 $ 172,000 $ 645,000        
Total commercial and industrial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans 19,150,133,000   19,150,133,000     $ 19,520,168,000    
Recorded investment 4,099,000 $ 5,390,000 11,547,000 $ 12,588,000        
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans $ 1,600,000,000   $ 1,600,000,000          
Substandard                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan substandard period (in days)     90 days          
Loss and Charged Off                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan charge off (in days)     120 days